Architects, civil engineers, toy companies, NASA, bio-medical research companies, and the data storage industry are all recent users of technologies that developed from research in MSE. Most fields in science and engineering are concerned in some way with materials, but only the field of materials science and engineering focuses directly on them.
Permanent hair dye lasts up to eight weeks. A hair dyeing kit. Semi-permanent hair dye cannot be used to lighten hair. Henna can be used to make a semi-permanent hair dye. Semi-permanent hair color lasts about six weeks or up to about 24 shampoos. When dying hair, it's recommended to wear gloves to prevent staining the hands.
  Most permanent dyes process in about 25-30 minutes.   I would imagine most semi-and demi-permanent dy â¦ es are about the same.   If you are using a vegetable dye (such as manic panic, special effects, or henna) you may leave on as long as you want, from 30 minutes to overnight.